Accession Number : AD0262472

Title :   INVESTIGATIONS OF FLUSH-MOUNTED ANTENNAS

Corporate Author : AERO GEO ASTRO CORP ALEXANDRIA VA

Personal Author(s) : BOWIE,D.M. ; GROSS,B.R.

Report Date : 28 JUN 1961

Pagination or Media Count : 1

Abstract : Three areas were investigated: (1) corrugated surfaces with barriers a wavelength in height, (2) corrugated surfaces with barriers one-quarter wavelength in height, and (3) interferometer height-finding techniques. Under the first investigation the effect of a coarse corrugated structure having large, widely spaced barriers on vertically polarized waves was examined. Patterns are shown indicating the wave was not bound by the medium. The second investigation was initiated using a corrugated surface with adjustable spacing with barriers of height less than onequarter wavelength. Results show, for spacing from 0 to 1/2 wavelength, a reduction in phase velocity and for spacing from 1/2 to 3/4 wavelength, phase velocity greater than the freespace value indicated. An experiment for demonstrating the technique of the interferometer height-finder was planned, which makes use of two radiation sources at a scale frequency at approximately 500 me. This region makes it possible to extract phase information directly from the received signal and avoids the use of signal conversion techniques, which may present phase distortion errors. (Author)

Descriptors :   *RADIO INTERFEROMETERS, *SLOT ANTENNAS, ANTENNA RADIATION PATTERNS, ANTENNAS, CRYSTAL MIXERS, ELECTROMAGNETIC RADIATION, ELECTROMAGNETISM, HEIGHT FINDING, MATHEMATICAL ANALYSIS, MEASUREMENT, MICROWAVES, PHASE DISTORTION, PHASE MEASUREMENT, PROPAGATION, SURFACES, ULTRAHIGH FREQUENCY, WAVE PROPAGATION, WAVEGUIDES

Distribution Statement : APPROVED FOR PUBLIC RELEASE